The model number for my 40 year-old plus is 73-3449-05.
The gasket is a circle, and it is 5 inches in diameter. It is held in place by the ring that goes around the light globe.
I need more information regarding the type of material from the automotive store. Is it cork, or what is it? My concern is I don't want it to catch fire when I use my oven, or when I use the cleaning element that comes with this model of oven. When I clean the oven for two hours, it becomes extremely hot. I need an answer to what kind of material I should ask for at the automotive place. And, I need to know that it is not combustable in the situations that I have mentioned.
One last question--
Does there absolutely have to be a gasket behind that light assembly? I wa s thinking of just putting in the new light bulb and attaching the globe and ring without any gasket.